a {
    text-decoration: none;
    color: #fff;
}
.pc {
    width: 100vw;
    height: 100vh;
    position: relative;
    background: url(../images/777.jpg);
    z-index: 1;
    max-width: 100%;
}
.pc .cover {
    background: url(../images/999.png)no-repeat;
    width: 757px;
    height: 670px;
    position: absolute;
    right: 100px;
    top: 80px;
    background-size: contain;
}

.slogan {
    position: absolute;
    top: 120px;
    left: 120px;
}

.download {
    position: absolute;
    color: #999;
    text-decoration: none;
    top: 200px;
    left: 120px;
    height: 347px;
    width: 450px;
}

.dlup {
    margin-top: 100px;
}

.tub1 {
    background-color: rgb(0, 128, 255);
    width: 200px;
    height: 50px;
    float: left;
    margin: 10px;
    text-align: center;
    line-height: 50px;
    cursor: pointer;
}

.tub {
    background-color: black;
    width: 200px;
    height: 25px;
    float: left;
    text-align: center;
    line-height: 25px;
}

#tub {
    margin-top: 10px;
}

#tub2 {
    margin-left: 10px;
    float: right;
}

.download1 {
    position: absolute;
}

.tub2 {
    background-color: black;
    width: 200px;
    height: 25px;
    float: right;
    text-align: center;
    line-height: 25px;
    position: relative;
    right: 30px;
}

.tub3 {
    background-color: black;
    width: 200px;
    height: 25px;
    float: left;
    text-align: center;
    line-height: 25px;
    position: relative;
    left: -200px;
    top: 25px;
}

.tub4 {
    background-color: black;
    width: 200px;
    height: 25px;
    float: right;
    margin-left: -190px;
    text-align: center;
    line-height: 25px;
    position: relative;
    right: 30px;
}

.dlup1 {
    margin-top: 100px;
    margin-left: 10px;
}

.and {
    position: absolute;
    left: 50px;
    top: 260px;
}

.and a {
    color: #999;
}

.erweima {
    position: absolute;
    top: 315px;
    left: 10px;
}

#tub3 {
    background-color: black;
    width: 200px;
    height: 25px;
    float: right;
    text-align: center;
    line-height: 25px;
    position: relative;
    right: 30px;
}
#guan{
    float: left;
    position: relative;
    right: -1050px;
    top: -300px;
}